Journal
CATALYSIS LETTERS
Volume 87, Issue 1-2, Pages 1-5Publisher
SPRINGER
DOI: 10.1023/A:1022821630812
Keywords
AFM; XPS; silver; alpha-alumina; 1,2-dichloroethane; epoxidation; ethane; sintering
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The stability under reaction conditions of realistic Ag/alpha-alumina model catalysts prepared by an appropriate wet chemical route has been studied by AFM and XPS. Although thermal and oxygen-induced sintering of Ag particles on {0001}alpha-alumina are significant, parts per million levels of dichloroethane have a much larger effect. It is suggested that this latter effect is due to AgCl-mediated intra-particle transport of silver. Such chlorine-induced sintering is likely to be the principal cause of the loss of Ag metal area under industrial conditions.
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